Question

Which of these identifies a difference in the braking system of a combination truck with doubles/triples from the braking system of a combination truck with only one trailer?

Accepted Answer

Double/triple trailers have more parts that control the brakes on doubles and triples.

Answer

Double/triple trailers have two air lines—an emergency line and service line.

Answer

Doubles and triples do not have spring brakes.

Answer

Some doubles have spring brakes but no triples have spring brakes.

Question 33 - Doubles/Triples Test Practice Test for the CDL